raynix 筆記

Tag: kubernetes

  • Don’t Panic When Kubernetes Master Failed

    It was business as usual when I was upgrading our Kubernetes cluster from 1.9.8 to 1.9.10, until it isn’t. From AWS console I can see the new instance for the master is running and the old one has been terminated. There’s 1 catch though, the IP yy.yy.yy.yy is not the IP of the new master…

  • Upload Limit in Kubernetes Nginx Ingress Controller

    According to https://github.com/nginxinc/kubernetes-ingress/issues/21#issuecomment-408618569, this is how to lift the upload limit in Nginx Ingress Controller for Kubernetes after recent update to the project: apiVersion: extensions/v1beta1 kind: Ingress metadata: name: test-project-ingress namespace: test-project-dev annotations: kubernetes.io/ingress.class: dev nginx.ingress.kubernetes.io/proxy-body-size: 200m spec: rules: – host: test-project.dev.com http: paths: – path: / backend: serviceName: test-project servicePort: 80 And for now…

  • Auto Scaling in Kubernetes 1.9

    I updated my Kubernetes cluster from 1.8 to 1.9 recently, the upgrade process is very smooth, however the auto-scaling part seemed to be failing. Below are some notes on how I troubleshoot this issue. First to ensure I have both kops and kubectl upgraded to 1.9 on my laptop: Install kubectl 1.9: curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.9.10/bin/linux/amd64/kubect…

  • Playing with Kubernetes Ingress Controller

    It’s very very easy to use Kubernetes(K8s) to provision an external service with AWS ELB, there’s one catch though(at least for now in 2018). AWS ELB is usually used with an auto scaling group and a launch configuration. However with K8s, EC2 instances won’t get spun directly, only pods will, which is call Horizontal Scaling.…

  • Kubernetes Log Aggregation with Filebeat and Logstash

    Following last blog, Filebeat is very easy to setup however it doesn’t do log pattern matching, guess I’ll need Logstash after all. First is to install Logstash of course. To tell Filebeat to feed to Logstash instead of Elasticsearch is straightforward, here’s some configuration snippets: Filebeat K8s configMap: — apiVersion: v1 kind: ConfigMap metadata: name:…

  • Kubernetes Cluster Log Aggregation with Filebeat

    Finally the Kubernetes cluster I was working on went live, and I didn’t provide a log aggregation solution yet. I had a look at dynaTrace, which is a paid SaaS. However it requires to install some agent in every container. It’s fun when there’s only several to play with but I wouldn’t rebuild dozens of…

  • Kubernetes External Service with HTTPS

    This is a quick example to assign an SSL certificate to a Kubernetes external service(which is an ELB in AWS). Tested with kops 1.8 and kubernetes 1.8. — apiVersion: v1 kind: Service metadata: name: my-https-service namespace: my-project labels: app: my-website-ssl annotations: service.beta.kubernetes.io/aws-load-balancer-ssl-cert: “arn:aws:acm:ap-southeast-2:xxx:certificate/xxx…” service.beta.kubernetes.io/aws-load-balancer-backend-protocol: “http” service.beta.kubernetes.io/aws-load-balancer-ssl-ports: “https” service.beta.kubernetes.io/aws-load-balancer-connection-idle-timeout: ‘3600’ spec: type: LoadBalancer selector: app: my-website…

  • Get access to a container in Kubernetes cluster

    With Kubernetes(K8s), there’s no need to do ssh user@host anymore since everything is running as containers. There are still occasions when I need shell access to a container to do some troubleshooting. With Docker I can do It’s quite similar in K8s However in K8s containers have random IDs so I need to know the…